基于地音监测的近直立煤层冲击地压前兆特征研究  

Precursor characteristics of rock burst in near-vertical coal seam based on geoacoustic monitoring

作　　者：刘昆轮 闫瑞兵 LIU Kun-lun;YAN Rui-bing(Shenhua Xinjiang Energy Co.,Ltd.,Urumchi 830027,China)

机构地区：[1]神华新疆能源有限责任公司,新疆乌鲁木齐830027

出　　处：《煤炭工程》2020年第4期48-51,共4页Coal Engineering

基　　金：国家重点研发计划项目(2017YFC0804205);国家自然科学基金项目(51874231,51504184)。

摘　　要：为了解决近直立煤层冲击地压监测预警的难题,以乌东煤矿近直立煤层为工程背景,研究+450水平B3+6综放工作面历次冲击地压前后地音事件能量和频次的演化规律,识别冲击地压前兆信息。结果表明:冲击地压造成的巷道破坏位置主要集中在超前工作面0~200m,且B6巷破坏程度大于B3巷,破坏形式以帮鼓为主,冲击地压主要影响因素为B6巷顶板岩层以及B3+6和B1+2煤层之间的岩柱;在冲击地压发生前,地音事件活动性经历一个平静期向强烈期过渡的过程;地音活动性由平静向强烈突然转变的现象可以作为冲击地压前兆信息。Aiming at the difficulty in geoacoustic monitoring for rock burst monitoring and early warning of near-vertical seam,the evolution law of the energy and frequency of acoustic emission events after rock burst are studied and the precursor information of rock burst is recognized based on previous rock burst events of Wudong Coal Mine B3+6 working face in +450 level. The results show that roadway damage caused by rock burst mainly happens in 0 ~ 200 m from the advance working face,wall heaving is the major damage mode,and B6 lane is more severely damaged than B3 lane. The main influencing factors of rock burst are the roof rock strata of B6 lane and the rock pillar between the B1+2 coal seam and B3+6 coal seam. Before the rock burst,the activity of acoustic emission events transferred from a quiet period to a strong period,which can be used as a precursor information of rock burst.

关 键 词：地音监测 近直立煤层 冲击地压 前兆信息 

分 类 号：TD324[矿业工程—矿井建设]